Improved device for nicking screws



UNITED STATES PATENT OFFICE.

COMPANY, 0E

SAME PLACE.

I'MPROVEDD'EVICE FOR NICYKING SCREWS.

Specification forming part of Letters Patent No. 68,592, dated September`10, 1867.

To all whom it may concern;

Be it known that I, JARED A. AYREs, of 1 Hartford, in the county ofHartford and State of Connecticut, have invented a ne'w and ImprovedMethod of Nicking Screws or Screw- Blanks; andI do hereby declarethatthe folshows an end view of the'same when the saws aresituated in thesame plane. Fig. 3 shows an end view of two saws, A A', placed atanangle with each other, having their axes AC C and ,0' C inclined in sucha manner that the ws cut a dovetailed slot in the head of the- Myinvention consists in using two or more saws inthe operation of 'nickingor s lotting screws, instead 'of but one, as is usually the case,wherebyI can make a cleaner andbet-- tel-slot on account of the nishing-sawinotbe-V ing quickly dulled by'takinga heavy chip, and can also make theslot or nick of a dovetailed or other desired forni. Each saw alsotaking a much lighter-shaving, the screw can be fed up to it muchasterwithoutdanger of breaking or clogging, 1Thesaws also last muchlonger and` require replacing less frequently;

The saws can all be set-in the same plane,

as shown in'Fi'g. 1, and'the'cend view, Figf2, cutting a square' nickwith parallel sides,lor

they can be arranged atanangle', soas to cut the sides of the nick atany desired-angle, as v shown in Fig. 3, forming a slot with-inclinedsides.

4What I claim as my invention, and desire I to secure by LettersPatent', is-

A The use of two or more saws situated -in different planes andoperating1 successively upon the heads of screws or screwlblanks to forma nick. or slot, substantially as setv dovetailed forth.

f J. A. AYRES.l

Witnesses l W. Gr.' FITCH,

THEO. G. ELLIS.

